VOL,
I don't know of a cause to lose CYA in an opened, swimmable pool.
(Winter...yes)
I would chalk it up to "one of those things" and go back to 40ppm. I'll bet you stay there all Summer.
Say, were you chit-chatting on that new, waterproof phone and having an adult beverage when you did that 25ppm test? Yep....that explains it!![]()

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Of course, I am on the BBB plan now, so I can buy new toys for the pool, and still save $$$.

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